tub advise

i weigh wayyyyyyyyyyy too much. do i resurface my cast iron tub in the color i need, or do i buy a enamel coated steel, acrylic or fiberglass tub. I am remodeling the whole bathroom walls, floors, fixtures, everything.
i am having a contractor friend do the works so it would be done correctly and i would hire a professional resurfacing company if that is the route i go.
thanx
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